Good morning, Marty Ryan and FilmOnly;

Regarding the Minolta 1.4/58 lens; the question of an internal glass element in the lens having a radioactive (ionizing radiation) characteristic is valid. The early versions of this lens did have glass with that characteristic, but at a very low level, similar to the Pentax 1.4/50 lenses. If you store them in a case for a long time, you might see a yellow cast to the color of the lens when you take it out. Put it in a place where ultraviolet (UV) radiation can pass through it, and the yellow color cast will go away. A southern exposure window sill will do fine.

And, in spite of the recommendations of Sir Thomas Lehrer, no, you do not need to wear lead BVDs when using this lens.